Meaning of “nemesis” in the English Dictionary

british dictionary

"nemesis" in British English

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nemesisnoun [ C ]

uk /ˈnem.ə.sɪs/ us /ˈnem.ə.sɪs/ plural nemeses literary

Someone's nemesis is a person or thing that is very difficult for them to defeat.

(a cause of) punishment or defeat that is deserved and cannot be avoided:

The tax increases proved to be the president's political nemesis.

(Definition of “nemesis” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)